Shelf assembly



FIG. 1 is a fragmentary top, front, and left side isometric view of a shelf assembly, with the right end wall being a mirror image of the left end wall; and,

FIG. 2 is a top plan view of the shelf assembly partially illustrated in FIG. 1.

The broken line disclosure in FIGS. 1 and 2 is understood to represent portions of the shelf assembly in which the claimed design is embodied but which does not form part of the claimed design. FIG. 1 is shown in fragmentary form for ease of illustration. 

The ornamental design for a shelf assembly, as shown and described. 